About: http://webisa.webdatacommons.org/195584251

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	While not a full answer to your questions, here is a trick that will allow you to reduce the collection of numbers you have to try (and so an answer to question 2).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com